options {
	directory "/var/cache/bind";

	managed-keys-directory "/var/cache/bind";
	dump-file "/var/cache/bind/cache_dump.db";
	statistics-file "/var/cache/bind/bind_stats.txt";
	memstatistics-file "/var/cache/bind/bind_mem_stats.txt";

	// If there is a firewall between you and nameservers you want
	// to talk to, you may need to fix the firewall to allow multiple
	// ports to talk.  See http://www.kb.cert.org/vuls/id/800113

	// If your ISP provided one or more IP addresses for stable 
	// nameservers, you probably want to use them as forwarders.  
	// Uncomment the following block, and insert the addresses replacing 
	// the all-0's placeholder.

	// forwarders {
	// 	0.0.0.0;
	// };

	//========================================================================
	// If BIND logs error messages about the root key being expired,
	// you will need to update your keys.  See https://www.isc.org/bind-keys
	//========================================================================
	dnssec-enable yes;
	dnssec-validation auto;

	listen-on { any; };
	listen-on-v6 { any; };

	version none;

	auth-nxdomain no;

	recursive-clients 4096;

	querylog yes;

	allow-update { none; };
	allow-transfer { none; };

	allow-query { any; };
	allow-query-cache { internals; } ;
	allow-recursion { internals; };
};